因为spi_sync函数是发起一个同步传输的阻塞API。它会通过master->transfer把spi_message结构挂在spi_master的queue字段下，然后启动专门为spi传输准备的内核工作线程spi_pump_messages，把spi_message从队列中移除，然后调用master->prepare_transfer_hardware回调来让控制器驱动准备必要的硬件资源，最后master->...
Android7.0，编写一个SPI驱动程序，混杂设备的写数据函数中 spi_sync函数返回-22，内核打印提示 ...
4. **数据传输方向**：确保在Spi_SyncTransmit函数中，数据传输方向设置正确。如果设置错误，可能导致...
It seems "spi_sync" never returns. The bug occurs randomly after a few hours of correct behavior. Could it be a locking problem? Any idea? I have seen @zhoushix's commits about SPI+DMA. However, if I enable dma for mcp151x or for spidev, the mcp151x driver can't access the con...
In the probe function of module_spi_driver, after spi_setup(spi), I called spi_write_then_read function in which spi_sync is called. Then tegra_spi_transfer_one_message function in file spi-tegra114.c is called. After t…
我想问一下这个SPI_SYNC命令具体是怎么操作的,还有假如我选择的是连续转换模式,是不是 更改寄存器设置后,通过输入SPI_SYNC命令后 AD 才开始输出数据 0 2018-7-31 06:49:48 评论 淘帖 邀请回答 康选谦 相关推荐 • AD7768 SPI_SYNC命令具体是怎么操作的? 318 • 利用stm32与AD7768通信读取电压...
spi_message_init_with_transfers(&msg, xfers, index); return spi_sync(spi, &msg); return spi_sync_transfer(spi, xfers, index); } static int ocelot_spi_regmap_bus_write(void *context, const void *data, size_t count) 0 comments on commit 74d26d7 Please sign in to comment. Footer...
exit_sync_config();spi_dma_sync_config();之后，按下按键，就可以触发DMA传输，测试如下：上面配置...
1.关于SPI SPI机制: SPI的全名为( Service Provider Interface ) 这个是针对厂商或者插件的。 (1)SPI思想 系统里抽象的各个模块,往往有很多不同的实现方案,比如日志模块的方案, xml解析模块、jdbc模块的方案等。 向的对象的设计里,我们一般推荐模块之间基于接口编程,模块之间不对实现类进行硬编码。
status = Lpspi_Ip_SyncTransmit(&SLAVE_EXTERNAL_DEVICE, pTxData, pRxData, length, 1000); if( LPSPI_IP_STATUS_SUCCESS == status ) { retval = true; } However, even if Interrupt is set, the Finish interrupt does not occur. status = Lpspi_Ip_Init( &Lpspi_Ip_PhyUnitConfig...